Explanation

Pressure is typically measured in units of force per unit area.

In the Imperial system, pressure is commonly measured in Pounds per Square Inch (PSI).

This is a widely used unit of pressure in engineering, physics, and many other fields.

Other common units of pressure include:

• Atmospheres (atm)
• Bars
• Pascals (Pa)
• Torr

Explanation

Gamma-ray cameras can observe radiations from the radioisotopes that are concentrated in the organs.

In medical imaging, radioisotopes are often used in nuclear medicine to diagnose and treat various conditions.

These isotopes emit gamma rays as they decay, and the gamma-ray camera detects these rays to create images of the organs where the isotopes have accumulated.

Explanation

For non-Ohmic materials, the current-voltage (I-V) relationship does not follow Ohm's law, which states that current is directly proportional to voltage (resulting in a linear I-V graph).

In non-Ohmic materials, the relationship between current and voltage is non-linear, and the I-V graph is typically curved.

Examples of non-Ohmic materials include diodes and transistors, where the resistance changes with voltage or current.

Explanation

A galvanometer is used as a null detector in a Wheatstone bridge.

It detects the zero current condition, indicating that the bridge is balanced.

Explanation

A common method of protection in a lighting circuit is to use a fuse.

It prevents damage by disconnecting the circuit if an overload or short circuit occurs.

Explanation

•  Sun has a temperature of around 6,000 °C and glows orange/yellow.
• This color is due to the blackbody radiation emitted by the Sun at this temperature, which peaks in the visible spectrum around yellow.

Explanation

• Echoes are repeating sounds that are reflected back to the listener after the original sound has stopped.
• They are a result of sound waves bouncing off a surface and returning to the listener, creating a repeated or echoic effect.

Explanation

• A rainbow is a beautiful natural phenomenon that demonstrates the spectrum of white light.
• When sunlight passes through water droplets in the air, it is refracted and separated into its individual colors, creating the colorful arc of a rainbow.
• This is a perfect example of the spectrum of white light.

Explanation

• Copper is an excellent conductor of heat, having a high thermal conductivity (386 W/mK).
• This means it can efficiently transfer heat energy with minimal resistance.
• Metals (e.g., iron, copper, silver, mercury, aluminum) are good conductors of heat.

Explanation

• The speed of sound is minimum in gases because the particles are farthest apart, resulting in a slower transmission of vibrations.
• In gases, the speed of sound is approximately 343 meters per second at room temperature and atmospheric pressure.